strengthen coverage suite

Author: Artem Ermoshkin

.github/workflows/coverage.yml

@@ -61,9 +61,13 @@ jobs:
       - name: Test
         shell: bash
         run: |
+          set -euo pipefail
+
           IAM_REGEX='^(DriverAuth|TMetadataFixture|TJwtIamFixture|TOAuthIamFixture|OAuth_WithFacility)\.'
+          FLAKY_REGEX='(ManyMessages|DiscoveryHang|DescribeHang)'
+          EXCLUDE_REGEX="${IAM_REGEX}|${FLAKY_REGEX}"
 
-          ctest -j1 --preset coverage-all -E "${IAM_REGEX}" --output-on-failure
+          ctest -j1 --preset coverage-all -E "${EXCLUDE_REGEX}" --output-on-failure
 
           cleanup_iam() { docker rm -f ydb-iam >/dev/null 2>&1 || true; }
           trap cleanup_iam EXIT
@@ -85,6 +89,13 @@ jobs:
             sleep 2
           done
 
+          if ! docker exec ydb-iam /ydb --endpoint grpc://localhost:2136 \
+              --database /local sql -s 'select 1' >/dev/null 2>&1; then
+            echo "ydb-iam failed to become ready"
+            docker logs ydb-iam 2>&1 | tail -50
+            exit 1
+          fi
+
           YDB_ENDPOINT=localhost:2236 YDB_DATABASE=/local \
             ctest -j1 --test-dir build -R "${IAM_REGEX}" --output-on-failure